Root note 2 4.3 mac

Frequently Asked Questions on R for Mac OS X
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Once done, click with the third button to change the characteristics of the curly line, like transform it to wave, change the wavelength, etc. A Curly Arc : Proceed like for an ellipse. The first click is located at the position of the center, the second click at the position of the arc beginning. Once done, one obtains a curly ellipse, for which one can click with the third button to change the characteristics, like transform it to wavy, change the wavelength, set the minimum and maximum angle to make an arc that is not closed, etc.

All TLatex expressions are valid. To move the text or formula, point on it keeping the left mouse button pressed and drag the text to its new position. If you position the mouse near the bottom-end of the text, you can rotate it. A Marker : Click with the left button where to place the marker. A Graphical Cut : Click with the left button on each point of a polygon delimiting the selected area.

Close the cut by double clicking on the last point. A TCutG object is created. It can be used as a selection for a TTree ::Draw. You can get a pointer to this object with:. Once you are happy with your picture, you can select the Save as canvas. C item in the canvas File menu. This facility also works if you have other objects not drawn with the graphics editor histograms for example.

The ROOT graphics editor loads the corresponding object editor objEditor according to the selected object obj in the canvas respecting the class inheritance. An object in the canvas is selected after the left mouse click on it. For example, if the selected object is TAxis , the TAxisEditor will shows up in the editor frame giving the possibility for changing different axis attributes. The graphics editor can be:. It appears on the left side if the canvas window allowing users to edit the attributes of the selected object via provided user interface.

The name of the selected object is displayed on the top of the editor frame in red color. If the user interface needs more space then the height of the canvas window, a vertical scroll bar appears for easer navigation. Global - has own application window and can be connected to any created canvas in a ROOT session. It can be activated via the context menu entries for setting line, fill, text and marker attributes for backward compatibility, but there will be a unique entry in the near future.

The user interface for the following classes is available since ROOT v. Object oriented programming introduces objects, which have data members and methods. The next line creates an object named f1 of the class TF1 that is a one-dimensional function. The type of an object is called a class. The object itself is called an instance of a class. When a method builds an object, it is called a constructor. The first parameter, func1 is the name of the object f1.

Most objects in ROOT have a name. ROOT maintains a list of objects that can be searched to find any object by its given name in our example func1. So now, we understand the two lines of code that allowed us to draw our function. Other methods can be applied to the object f1 of the class TF1.


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For example, the evaluating and calculating the derivative and the integral are what one would expect from a function. By default the method TFPaint , that draws the function, computes equidistant points to draw it. The number of points can be set to a higher value with:. Note that while the ROOT framework is an object-oriented framework, this does not prevent the user from calling plain functions.

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Now we will look at some interactive capabilities. Every object in a window which is called a canvas is, in fact, a graphical object in the sense that you can grab it, resize it, and change its characteristics with a mouse click. For example, bring the cursor over the x-axis. The cursor changes to a hand with a pointing finger when it is over the axis. Now, left click and drag the mouse along the axis to the right. You have a very simple zoom. When you move the mouse over any object, you can get access to selected methods by pressing the right mouse button and obtaining a context menu.

If you try this on the function TF1 , you will get a menu showing available methods. Try clicking on these and observe the context menu with their methods. For example try selecting the SetRange method and putting , 10 in the dialog box fields. This is equivalent to executing f1. SetRange ,10 from the command line, followed by f1. Here are some other options you can try. Once the picture suits your wishes, you may want to see the code you should put in a script to obtain the same result.

C entry of the File menu. This will generate a script showing the options set in the current canvas. Another interesting possibility is to save your canvas into the native ROOT format. This will enable you to open it again and to change whatever you like. All objects associated to the canvas histograms, graphs are saved at the same time. Once again, we call the constructor of a class, this time the class TCanvas. The difference between this and the previous constructor call TF1 is that here we are creating a pointer to an object.

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Next, we call the method Divide of the TCanvas class that is TCanvas::Divide , which divides the canvas into four zones and sets up a pad in each of them. We set the first pad as the active one and than draw the function f1 there. All objects will be drawn in that pad because it is the active one. The ways for changing the active pad are:.

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Pads are numbered from left to right and from top to bottom. To apply the method cd to the third pad, you would write:. Please note that saving the canvas this way will overwrite the file with the same name without a warning.

The user choice is saved for the next time the Save As… dialog shows up. The Print command in the canvas File menu pops-up a print dialog where the user can specify a preferred print command and the printer name. Both print parameters can be set via the new Print. Command and Print. Printer rootrc resources as follows:.